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Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Mar. 31, 2023
Deferred Tax Assets, Net, Total	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards		$ 336
Open Tax Year	2019 2020 2021 2022
Open Tax Period (Year)	3 years
Domestic Tax Authority [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards		$ 289
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Open Tax Year	2018 2019 2020 2021 2022
Open Tax Period (Year)	4 years

X

- Definition

The period of time that certain aspects of the business may be under review for tax purposes.

+ References

No definition available.

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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- Definition

Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
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